Having a single account / ID for company wide services seems pretty obvious to me. If you take Apple for example, they have always had a single account for their online shop, itunes, app store, etc.

Now, as others have said, I don't know how this could be useful on devices like TVs and such. And sony isn't exacty known to be very innovative in that domain. I have a sony TV that can connect to the internet, but it can't do anything with that connection (not event upgrade its firmware).

As always, it's wait-and-see. But it seems to me there's usually more waiting than seeing...

Don't try to find any meaning to "HD audio". It's pure Buzzword Bullshit. Me hates.

I don't know the situation in the US, but roaming charges are also outrageous here in Europe. The thing is the operators of neighboring countries have agreements so that they charge way less roaming fees when you connect to a foreign tower close to the countries borders (typically about 20km).